BMW 550i GT xDrive Rear Door Panel Speaker Size
The BMW 550i GT xDrive rear door panel accommodates 1 inch speaker size and 4 inch speakers. Compatible audio types for these locations include tweeters and midrange units. The specifications cover 2010 through 2017.
| Year | Type | Size (inch) |
|---|---|---|
| 2017 | Tweeter | 1 |
| 2017 | Midrange | 4 |
| 2016 | Tweeter | 1 |
| 2016 | Midrange | 4 |
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2013 | Midrange | 4 |
| 2012 | Tweeter | 1 |
| 2012 | Midrange | 4 |
| 2011 | Tweeter | 1 |
| 2011 | Midrange | 4 |
| 2010 | Tweeter | 1 |
| 2010 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Tweeter | A small driver built for high frequencies, typically from about 2,000 Hz to 20,000 Hz. It adds treble detail and clarity and is usually mounted near ear level or aimed at the listener. |
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
Additional Notes
- The rear door panel location on the BMW 550i GT xDrive positions speakers within the vehicle's door cavity, where the mounting surface is typically angled toward the cabin interior and bounded by the structural frame of the door.
- Door panel installations are subject to spatial constraints imposed by the door's internal hardware, including window regulators and wiring, which limits the available depth and diameter for speaker mounting.
- The 4-inch midrange driver in the BMW 550i GT xDrive rear door panel operates in the vocal and upper-bass frequency band, roughly spanning 300 Hz to 5 kHz, where instruments and human voice carry much of their fundamental tonal character.
- A 4-inch cone driver in a door panel benefits from the partial acoustic loading provided by the door cavity behind the mounting surface, which can influence low-frequency extension and output efficiency at the rear seating position.
- The 1-inch tweeter handles high-frequency reproduction, generally from around 2 kHz upward, where treble detail, transient response, and stereo imaging are most dependent on driver placement and directional dispersion.
- A 1-inch tweeter mounted in the rear door panel places the high-frequency source at a low point relative to seated passengers, which affects the vertical angle of treble dispersion toward rear occupants.
- Tweeters of 1 inch diameter have a relatively narrow dispersion pattern at the upper reaches of their frequency range, meaning the listening axis and mounting angle within the rear door panel directly influence perceived treble balance for rear seat listeners.
- The combination of a 1-inch tweeter and a 4-inch midrange within the same rear door panel reflects a multi-driver configuration, where each unit handles a distinct portion of the audible spectrum within that single installation zone.
- Rear door panel placement for both drivers means the sound source for rear passengers originates from beside and slightly forward of the seated ear, a positioning that affects soundstage localization differently than front-door or dashboard-mounted speakers.
- The 4-inch diameter constrains excursion capability compared to larger drivers, which limits maximum acoustic output at lower midrange frequencies but allows the driver to fit within the tighter spatial envelope of a rear door panel.